FJ80 Hellfire Knuckles

FJ80 Hellfire High Steer Knuckles

High-steer knuckle set for 1991–1997 FJ80 axles with 25mm trunnions and D60 studs

These knuckles add true high steer to the FJ80 axle using reinforced castings, 6-stud steering arm retention, and a shimless set-screw preload system. Arms are pre-tapered for FJ80 tie-rod ends and can be reamed for GM 1-ton TREs or heim steering; each arm is double-tapered for left- or right-hand drive. Stud layout increases spacing to reduce leverage on the arms, and the lower cap is counterbored to protect hardware for reliable clamping under load.

The assembly uses 25mm trunnion pins and bearings for higher load capacity, with outer four Dana 60 studs (Grade 10.9) and two inner 1/2" Allen bolts (Grade 14) securing each arm. On stock FJ80 suspension, track bar relocation is required to clear the tie rod and correct drag link angle in a high-steer position. ABS sensors and brake backing plates are not retained due to knuckle thickness, and wheel backspacing must not exceed 4.5".

Key Features

• Part Number: PN2149
• Fits 1991–1997 FJ80 front axles
• True high-steer arms with 6-bolt retention; increased stud spacing
• Shimless set-screw knuckle preload (no shims)
• Arms pre-tapered for FJ80 TREs; reamable for GM 1-ton TREs or heims
• Outer four Dana 60 studs (Grade 10.9) + inner two 1/2" Allen bolts (Grade 14)
• 25mm upper/lower trunnion pins and bearings for increased strength
• Counterbored lower cap to shield bolt heads
• Maximum wheel backspacing: 4.5"

Kit Includes

• (1) Pair FJ80 Hellfire high-steer knuckles
• (1) Pair high-steer arms with FJ80 pre-tapered tie rod and drag link holes (double-tapered for LHD/RHD)
• (2) Sets 25mm upper and lower trunnion bearings and pins
• (1) Pair lower 25mm caps (pin welded in place)
• (8) 1/2" Dana 60 chromoly studs and nuts
• (4) 1-1/4" × 1/2" Allen head bolts for arms
• (8) 1" × 1/2" Allen head bolts for lower caps
• (2) Set screws with jam nuts

Note

For off-road use only. On stock FJ80 suspension, relocate the track bar to clear the tie rod and correct drag link angle; verify steering, brake line, and wheel clearance before final assembly. ABS sensors and brake backing plates are not supported, and wheels must be 4.5" backspacing or less.